Free periodically software for linux

polld is a simple daemon that periodically opens files defined in /etc/polld.
polld project can be used for scanning partitions in a card reader that does not report card insertion and removal.
I use this for scanning partitions in card reader, which does not report card
insertion/removal. With polld, they appear in 10 seconds after insertion and
udev will then create appripriate device nodes.
Enhancements:
- New release.
- Use LSB init script.

radlib is a C language library developed to abstract details of interprocess communications and common linux/unix system facilities so that application developers can concentrate on application solutions. It encourages developers (whether expert or novice) to use a proven paradigm of event-driven, asynchronous design. By abstracting interprocess messaging, events, timers, and any I/O device that can be represented as a file descriptor, radlib simplifies the implementation of multi-purpose processes, as well as multi-process applications.
radlib greatly improves typical process performance through the use of shared memory buffers to avoid costly "malloc" and "free" library calls. These buffers are also used for interprocess messages. radlib also utilizes shared memory constructs to provide global message queue management and global "Queue Groups" for increased interprocess communications flexibility.
All shared resources are semaphore protected to avoid issues with concurrent access. In short, radlib is a sincere attempt to provide real-time OS capability on a non-real-time OS. It has been successfully deployed on linux, MacOSX and FreeBSD but there is no reason it would not build and run on any flavor of unix supporting System V IPC.
Specifically, radlib provides fast system buffers, a simple config file utility, events, doubly-linked lists, process logging through syslog, message queues, semaphores, shared memory utilities, timers, stacks, state machine utilities, a process framework, a process management utility to start/stop groups of processes, optional MySQL or PostgreSQL database API, straightforward TCP/streams socket API, and other assorted system utilities.
Proprietary forms of radlib have been used in several mission-critical commercial applications with excellent results. It is light yet very powerful and efficient in real time. radlib is BSD-licensed (free to use in binary or source forms) and distributed as source to be built on the target platform. Build instructions are included in the distribution. See the file "COPYING" in the distribution for details concerning open source software and the BSD license.
radlib is currently used as the foundation of my unix/linux-based weather application, wview, which interfaces with the Davis Vantage Pro console to archive weather data in real-time and periodically (every 60 seconds) generate weather images and html files suitable for use on web sites (see my weather page). It uses multiple radlib processes which illustrate radlibs interprocess communications flexibility. Feel free to download the wview source as another example of radlib implementation.
Enhancements:
- Updated to work properly on both 32- and 64-bit architectures.
- No special configuration is required.
- A few API calls have been changed ("int" arguments became "long"), but only a few.
- This release increases the default system buffer numbers and adds an additional size of 8192 to better support 64-bit platforms.

servicemon is a simple service monitoring application written in Python. The project periodically calls the init scripts for services it has been configured to monitor and determines whether each service is running, restarting failed services as appropriate.
It can send e-mail alerts and has a network interface to talk to a graphical frontend. There is a graphical client available for Linux written in Python/GTK and also a Java client which will run on any platform supported by Suns Java.
Enhancements:
- This version features a Makefile to automate installation, an init script to start servicemon automatically on boot, and many fixes and improvements to the core code.

Hyperfeeder is an RSS/RDF news reader which prints the output of aggregated feeds in HTML format. Hyperfeeder is extensively customizable, with provisions for setting virtually every tag in the output.
Main features:
- view images (cartoon strips, image of the day, etc.) inline
- RSS fields like "textInput" result in elegant forms
- the output is portable and all you need is a web browser
- can run periodically on your machine via crontab

zufall is a simple program to change the background periodically.

The project takes one or more directories with images as a parameter (no GUI) and sets a randomly chosen image as background. If there is a border remaining, its color is the average color of two corners of the image. This mostly fits the image very well.

The program doesnt work if the root-window is hidden by another program, like in Gnome or KDE.

Installation

./configure && make

make install
or copy the binary "zufall" to a directory in your path.

The openais project is a project to implement a production quality "Revised BSD" licensed implementation of the SA Forums Application Interface Specification. OpenAIS project implements cutting edge research on virtual synchrony to provide 100% correct operation in the face of failures or partitionable networks with excellent performance characteristics.
The Application Interface Specification is a software API and policies which are used to develop applications that maintain service during faults. The API consists of Availability Management Framework (AMF) which provides application failover, Cluster Membership (CLM), Checkpointing (CKPT), Event (EVT), Messaging (MSG), and Distributed Locks (DLOCK).
Faults occur for various reasons:
- Application Failure
- Middleware Failure
- Operating System Failure
- Hardware Failure
The major focus of high availability in the past has been to mask hardware faults. Faults in other components of the system have gone unsolved until AIS. AIS can mask many types of faults in applications, middleware, operating systems, or even hardware by providing a simple framework for allowing developers to create redundant applications. These redundant applications can be distributed over multiple nodes such that if any one node faults, another node can recover.
Application programmers develop applications to periodically record their state using the checkpointing service. When an active application fails, a standby application recovers the state of the application. This technique, called stateful application failover, provides the fundamental difference between openais and other systems that have come before it. With stateful application failover, the end-application user doesnt have to reload the application or redial a telephone. The full state is recorded, so the end-application user sees no interruption in service.
Because programmers can now distribute applications across multiple processes or nodes, a mechanism must exist for them to communicate. This mechanism is provided by two services. The event service provides a publish/subscribe model for events. The messaging service provides end to end messaging. Finally a mechanism to synchronize access is provided by the distributed lock service.
Enhancements:
- This version significantly improves support for AMF B.02.01 n+m failover of components.
- Most of the QA that went into Whitetank (0.80.2) has been merged.

StockWatch! is a SuperKaramba theme that periodically retrieves stock quotes from the internet. Stock Watch! uses Yahoo! Finance data to obtain quotes.

MAILBOX wmnotify is a "DockApp" application, running under WindowMaker, to periodically check a POP3 or IMAP4 email account for new messages. It also supports SSL encryption.

When new messages are detected, the mailbox image is animated to give a visual indication that new mail has arrived. Additionnally, if desired, a sound can be produced from a WAV or AU audio file, or from the console bell.

For simplicity reasons, wmnotify doesnt support multiple POP3 accounts. But by starting a new instance of wmnotify and specifying an alternate configuration file on the command line, you can effectively check multiple POP3 accounts.